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use fewer registers in apply_welch_window_sse2 

Originally committed as revision 11882 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Loren Merritt 2008-02-09 05:29:47 +00:00
parent fa4ed8c10a
commit 2c70770e33
1 changed files with 7 additions and 8 deletions
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15
libavcodec/i386/flacdsp_mmx.c
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@ -36,7 +36,7 @@ static void apply_welch_window_sse2(const int32_t *data, int len, double *w_data
"addsd %%xmm6, %%xmm7 \n\t"
::"m"(c), "m"(*ff_pd_1), "m"(*ff_pd_2)
);
#define WELCH(MOVPD)\
#define WELCH(MOVPD, offset)\
asm volatile(\
"1: \n\t"\
"movapd %%xmm7, %%xmm1 \n\t"\
@ -44,24 +44,23 @@ static void apply_welch_window_sse2(const int32_t *data, int len, double *w_data
"movapd %%xmm6, %%xmm0 \n\t"\
"subpd %%xmm1, %%xmm0 \n\t"\
"pshufd $0x4e, %%xmm0, %%xmm1 \n\t"\
"cvtpi2pd (%4,%0), %%xmm2 \n\t"\
"cvtpi2pd (%5,%1), %%xmm3 \n\t"\
"cvtpi2pd (%3,%0), %%xmm2 \n\t"\
"cvtpi2pd "#offset"*4(%3,%1), %%xmm3 \n\t"\
"mulpd %%xmm0, %%xmm2 \n\t"\
"mulpd %%xmm1, %%xmm3 \n\t"\
"movapd %%xmm2, (%2,%0,2) \n\t"\
MOVPD" %%xmm3, (%3,%1,2) \n\t"\
MOVPD" %%xmm3, "#offset"*8(%2,%1,2) \n\t"\
"subpd %%xmm5, %%xmm7 \n\t"\
"sub $8, %1 \n\t"\
"add $8, %0 \n\t"\
"jl 1b \n\t"\
:"+&r"(i), "+&r"(j)\
:"r"(w_data+n2), "r"(w_data+len-2-n2),\
"r"(data+n2), "r"(data+len-2-n2)\
:"r"(w_data+n2), "r"(data+n2)\
);
if(len&1)
WELCH("movupd")
WELCH("movupd", -1)
else
WELCH("movapd")
WELCH("movapd", -2)
#undef WELCH
}